Hi there, I need some advice or information about a what I am about to do.

I use to have a 97 honda prelude with f-max turbo kit. The motor use a cheater copper head gasket that was about 1/4" thick to decrease the compression. The car ran fine for 3 years til my radiator fan went out for 2 months without me realizing it. well, my piston rings got fries during this summer.

Anyway, I have the motor torn down and rebuilt. Problem is the piston bore is 20mm over by the machine shop. The machine shop say it was safe. I end up buying a stock 20mm boreover pistons. Rite now, I am worry that the motor won't be able to handle the booste at 8 psi bc the cylinder walls are maybe to thin. I am planning to get rid of the copper head gasket and goes with the stock honda one because of the extra displacement.

Any advice be appriciate. I just want my motor to be fix one time with out problems.

20 sounds a little extreme, although I really only know about Bseries so an H may be able to take it. Even the biggest stroker kits only go 5-10mm over stock. 20 sounds like it'd really be pushing the limits.

There was a mistake on the information that was given. The bore was actually .02mm over. I guessing that would meant 2mm. I just look at the piston box and it said .02 boreover.

I still plan to forgo the copper head gasket and put a block guard on it. I want to booste between 8 -10 psi. With the 2mm, my mechanic say I would have a displacement of about 2.4 L. I should be able to booste about 12-15 psi daily. I was able do 15psi on my old setup on the track. I don't do that often.

Anyway, I still worry about my wall cylinder being to thin.

Putting aftermarket forged piston into stock FRM sleeves on the H22's is a big no no. The piston skirts will be torn up and turned to mush inside of a thousand miles. As of right now that block is garbage if they've already bored it out, you need to get the motor sleeved which is about a thousand dollars. If you don't have the money to get it sleeved you need to buy another stock H22A block, and keep the boost low again for a stock motor.

And they likely bored it .020" or .5mm over, .02mm is nothing. Seriously, if your machine shop doesn't know these kinds of things about honda motors it's time to find a new machine shop.

Putting aftermarket forged piston into stock FRM sleeves on the H22's is a big no no. The piston skirts will be torn up and turned to mush inside of a thousand miles. As of right now that block is garbage if they've already bored it out, you need to get the motor sleeved which is about a thousand dollars. If you don't have the money to get it sleeved you need to buy another stock H22A block, and keep the boost low again for a stock motor.

And they likely bored it .020" or .5mm over, .02mm is nothing. Seriously, if your machine shop doesn't know these kinds of things about honda motors it's time to find a new machine shop.
:werd:

I guessing from the box when it mention .02 boreover, it meant .02" rite. And not in mm. Damn, screwy label. :confused: So for ever .01" = about 2.5mm. Damn..this standard to meteric coversion. I am already confuse.

So let me ask, I should get another block and get the stock piston. Or get a whole complete lower block. I have spent $500 already to fix what block I had. Man...Alternative....no moola for sleeve for sure.

How about if I can find a stock piston piston that is made to be .02 boreover again. I know some place that does sell the stock piston that is .02 over. Stock material and not forge. I just don't have that kinda money anymore. Will my block be ok if I just do that and be in the safe limit of 8 psi with the block guard.

I willing to sell my JE piston that is .02 boreover with 9:1 compression. It is not in the block but still sit inside the box with rings.

and put a block guard on it.
:shakehead
Blockguards aren't the way to go, I've heard of several people having severe problems with them as far as things like warping, or getting out of round and screwing up the engine. I'd save the money like EK said and do it right, unless of course you have more money than common sense. I don't mean to be offensive or anything but do a search on blockguards.

I have research about the blockguard. It is good for top side preventive measure but not good for mid cylinder disruption. The machine shop work mostly on honda motor except that they never work on H22A4. Anyway, they are very reputitive and I trust them bc most my friends goes to them to get thier motor work on. About the blockguard, they have done that before. They say that they going to measured and cut to fit rite on to my block.

Problem is from what advice I was given, my lower block is a goner and have to get new block. that going to be at least $600. Just call to the JUNK yard. For a 99 H22A4 lower block with 75,000 miles.

That it...I getting rid of this car...'sight'

Block guards are a total waste. They do nothing for increasing structural rigidity in a non-knocking condition that a properly tuned engine operates within. The block guard will not save the sleeves; they will crack if the engine knocks. They also expand at a quicker rate because they are made out of a different materiel than the sleeves, typically 6061 aluminum, this rapid expansion causes them to oval the cylinders.

thank you all,

I planning to rebuilt my motor by buying the stock piston with a .02 boreover and forget the blockguard. I guess the Blockguard and JE pistons are more trouble then they are worth.

anymore advice can be helpful. I still had not the answer that I was looking for. Is my cylinder wall too thin with the .02 boreover and boosting 8-10 lb?